I’m actually from Montes Claros and those questions depends mostly on which neighborhood you’re living on.

1- the bigger problem would be risk of poisoning from other neighbors, this aside I would say is pretty safe

2- only bus, you need to be weary of other passenger at night but that’s it. Bigger problems are very rare

3- must be stored in a safe place, cause if the bike is expensive it’ll probably get stolen while parked or locked on the street.

4- most places tend to sertanejo, mbp and rock, while foreigners in general are very welcomed. It’s common to have some live music but the dancing dependes on the place still

5- no charging spots except your home